Caper, Hound of the Fields

{g}, Gain one life for each Good Dog or Good Cat creature among creatures you control. Play this ability only once during your main phase.
If a spell would transfer control of Caper,
you may choose to either:
• counter that spell unless its caster pays {3}.
• pay {w}, gain 3 life.
"Are you a good boy? What's that? Huh?"